I went in today for the first time in a week or so, and I saw that LiveJournal had been sending me notices that I'd be forced to change my password. I followed the link in the email, where I was prompted to put in my old password and my new. When I filled them in and tried to click through, I got an error saying my old password was wrong. I tried a couple-few more times before going with "I forgot my password" and following the prompts from the email generated from that. ONLY to find that my IP address was "temporarily blocked" due to too many login attempts!
Afterward, I discovered a LiveJournal email that was in Russian. I used Gmail's translation tool and found that the email was to notify me (in Russian) that my password had been disabled because I had not reset it quickly enough. The email also noted that I probably had not noticed, as my session had been kept open.
So if any of you are like me, not checking the email you've associated with your LiveJournal account, it would probably be a good idea to check. And if you're finding yourself unable to login, your password has probably been disabled!